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Re: Best Oil Wt for 2000 Blazer??
O2 sensor synthetic oil? There is no such thing.
If you want to go to synthetic, use Mobil 1 Synthetic 5w30 with a good oil filter. And don't use FRAM!
If you want to stick to normal oil, use Castrol GTX 5w30.
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1995 Factory Blazer Service Manual for sale, PM if interested.
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